Bending machine



NW. 216, o. scHAQs-iTEL BENDING MACHINE Original Filed Feb. 5, 1923 2 Sheets-Sheet Figv 3 Fig. 1"

INVENTOR. Ofto Sahac/r te/ A TTORNE Y.

Original Filed Feb. 5-, 1923 2 Sheets-Sheet 2 may/a a 40 9 9& 6 20 55 O 45 O :0 G x o a/ 52 /5 I 49 48 Iv j G 1 INVENTOR. W

0m 5d; ad: 119/ A TTORNEY.

Patented Nov. 26, 1929 time? gg t fi iili OTTO SCI-IACHTEL, OF CHICAGO, ILLINOIS BENDING MACHINE Original application filed February 5, 1923, Serial No. 616,958. Divided and this application filed. January This invention relates to bending machines and has for its object the production of an improved machine for bending together the outer ec ges of U-shaped strips or bars, so as to produce tubular pieces, particularly when such pieces are to have oblong cross-sections and of varying sizes and when the pieces themselves are bent transversely so as to form curved pieces, including pieces which have 19 radii of curvature passing from one side to the other such as S-shaped pieces.

Of the accompanying drawings Fig. 1 is a side elevation of a machine which embodies the features of my invention; Fig. 2 illustrates a piece ready to be operated on by the machine; Fig. 3 is an enlarged cross-sectional view of the piece before it has been operated on; Fig. 4 is a corresponding section after the piece has been operated on; Fig. 5 is a central sectional View of the head portion of the machine; Fig. 6 is a corresponding sectional view along the lines 66 of Fig. 5; and Fig. 7 is an enlarged elevation of some of the bending elements of the machine.

This application is a divisional application of my copending application, Serial No. 616,958, filed Feb. 5,1923 In that application I have illustrated and described a machine for bending strap metal or metal strips either transversely or longitudinally or both. One purpose of that machine is to bend longitudinal flanges on the edges of strips of metal or to bend the strips into U-shaped strips,

and the pieces thus formed may be more or J less tapering and may be bent transversely into S-shaped pieces. Such a tapering S-shaped strip is illustrated in Fig. 2 in the present application. And the object of the An machine described herein is to take such pieces after they have been bent longitudinally and close the longitudinal flanges, as is indicated by Fig. 4. And one of the specific objects of the machine is to be able to feed one end of these strips into the machine and have it automatically operated on so as to bend together the outer portions of the flanges the entire length of the piece, irrespective of whether ornot the pieces are tapered or bent transversely. In carrying out this bending process, I provide certain elements for receiv- Serial No. 4,387.

ing the piece to be bent for holding it properly, and for bending the sides gradually as the piece is automatically fed forwardly into the machine, the process being carried on step by step and the bending produced by a reciprocating member instead of by rollers.

After the strip has been bent both longitudinally and transversely into a curved piece with U-shaped cross-section, the spaced edges are bent together so as to form a tubular piece by the following described mechanism: The closing mechanism is mounted upon a frame 20, the mechanism being operated by the foot pedal 21 by means of a link 22 in conjunction with the continuously rotating pulley 23 which operates the closing mechanism. The closing mechanism comprises a hammer 25 having a groove 26 in its face which conforms to the shape to which it is desired to bend the lips of the piece. In starting the closing operation the operator presses downwardly on the lever 21 and thus lowers the clamping rollers 27, which are mounted on the slidably mounted bracket 24. The end of the piece 32 is then rested upon the rollers 27 with the toe ofa member 28 between its lips. This member 28 for convenience I call an anvil and it is mounted vertically in line with the hammer. The anvil is fixed to the frame 45 in which the hammer is mounted. The upper surface of the groove 26 in the hammer conforms to the desired upper surface of the closed piece. The shank of the anvil at all times projects upwardly through the slot formed by the open lips of the piece being operated on.

The ends of the lips to be closed are thus placed between the anvil and the hammer, and the hammer is then reciprocated vertically by means of the following described mechanism: The hammer is fixed to, or integral with, a block 30 which is pivotally connected to two levers 31 by means of trunnions 19 fixed to a block 83. The levers 31 are pivoted to the bracket 81 of the frame 20 by means of pins 34; and the other ends of the levers are pivoted to a pin 35 fixed to a block 36, upon which are mounted bearings 37 of rollers 38. These rollers coact with the surfaces of the cam 39 fixed to the shaft 40. Obviously when the shaft is rotated by the pulley 23, the ends 4:1 of the levers 31 will be reciprocated vertically and this in turn will reciprocate vertically the hammer 25. The reciprocations of the l asnr; acting on the lips of the sheet-metal piece, which rest upon rollers 27, will close the lips on the anvil 28.

In order to properly feed the piece 32 forwardly on the rollers I pivot the hammer block 30 to the frame 20 so that the hammer may be oscillated horizontally. The loclr 30 is slidably mounted in a frame e5 by means of rollers d6 rotatably mounted on the block by means of a pin 47, the rollers being; arranged to play in slots 48 in the ends of the walls of the frame la"). At the same time, by means of pins 50, the frame is pivoted to the frame 20. Hence the hammer may be oscillated horizontally; and the anvil 28 is fixed to the frame as so that the anvil always oscillates horizontally with the hammer.

Any suitable means may be provided to automatically produce the horizontal oscillations of the hammer and anvil. I prefer for the purpose to provide a link 51 which is pivoted to the frame 45 and to the lower end of a lever 52. This lever is pivoted to the frame 20 by means ofa bracket 53, and at its upper end it is pivoted to a stem 5% which is fixed to a frame 55 on which are rotatably mounted rollers 56. These rollers are arranged to co-act with the surface 57 of the cam 58 which is also fixed to the shaft 40. Obviously as the shaft e0 rotated the stem 54: will be reciprocated horizontally and this, by means of the lever 52, will reciprocate the link 51 and hence the hammer and anvil.

The horizontal reciprocations of the hammer and anvil will cause the sheet-metal piece to be moved forwardly on the anvil in the following described manner. A member 60 is fixed to the bracket 81 of the name 20, and the lower end of the member 60 is positioned normally adjacent the hammer. After the hammer and anvil are drawn baclrwardly away from the member 60, by the lever 52, the hammer strikes downwardly, bending together the lips of the piece being operated on, and the hammer holds the piece against the anvil, and together, as they are moved forwardly, they move the piece forwardly under the member 60. The hammer as it moves forwardly holds the piece down slightly below the member 60, pressing the rollers 27 downwardly against the force of the weight 61, so that the piece passes freely under the member 60. When the hammer reaches the farthest position to the left it is substantially against the member 60, and the hammer is then elevated allowing the piece to rise against the member 60 and clamping the piece between this member and he rollers 27 so as to prevent its move sent to the right when the anvil 28 is moved baclr to the right away and from the member 60. The movement of the anvil backward is not sufficient to withdraw the anvil entirely from under the member 60. The toe of the anvil therefore projects to the left of the hammer when each stroke is made and thus holds the lips from being distorted by the hammer by overlapping or some other abnormal bending.

The bloclrZlO may be guided in the frame 4:5 in any suitale manner, for example I prefer to ill; to the block a metal bar 49, preferably made of phospl'ior-bronae, on each side of the block 30, with th ends of the bars coming substantially against the inner surfaces of the frame 45. This, with the swivel arrangement of the block, allows it to oscillate freely and also allows a slight rotating movement of the block with reference to the levers 31 as thelevers oscillate, and at the same time the bars guide the hammer so that it always remains in its proper position. Any suitable means may be provided for adjusting the elevation of the hammer with reference to the member 60. I prefer to provide removable washer 80 which may be readily replaced by one of different thickness.

Although l: have herein referred to the member 2821s an anvil, yet its function is not altogether that of an anvil. The hammer has a concave surface corresponding to the outer upper surface of the tubular member which it is desired to produce, and this concave surface produces the proper shape of the tubular member, more or less irrespective of the shape of the anvil. Furthermore the anvil and the hammer act as a clamp by pinching he walls of the tubular memberbetween the sides of the anvil and the hammer, rather than between the upper part of the anvil the hammer. By this clamping means it is readily moved along as the hammer and anvil are oscillated towards the member 60.

I claim as my invention:

1. A bending mechanism comprising meansfor receiving strips with U-shaped cross-sections and then for closing the sides of said strips so as to form tubular members, the said closing mechanism comprising an anvil and a hammer positioned vertically above said anvil, and means for reciprocating said ham- Iner vertically over said anvil, and means for reciprocating said hammer longitudinally.

2. A machine for bending "the sides of elongated pieces into tubular pieces, compris ing an anvil adapted to pass between the lips of the sides of the piece being bent, a hammer having a concave pounding surface, means for reciprocating said hammer over said anvil, and means for moving said anvil along between said lips with reference to said lips as said lips are held closed by said hammer.

' 3. A machine for bending flanges of elongated pieces, comprising an anvil adapted to pass between the lips of the piece, a hannner having a concave pounding surface, means for reciprocating said hammer on said anvil, means for moving said anvil along between said lips with reference to said lips as said lips are held closed by said hammer, and means for preventing movement of said piece as said anvil is moved therein. I

4. A bending machine comprising means for closing the lips of elongated U-shaped pieces, said means comprising a clamping member, an anvil, and a hammer, said anvil being positioned between said lips, said hammer being positioned immediately over said lips and anvil, said clamping means being positioned adjacent said hammer and anvil and adapted to clamp the portion of said piece where the lips have been closed, and means for reciprocating said hammer vertically and longitudinally with reference to said lips.

5. A bending machine comprising means for closing the lips of elongated U-shaped pieces, said means comprising a clamping member, an anvil, and a hammer, said anvil being positioned between said lips, said hammer being positioned immediately over said lips and anvil, said clamping means being positioned adjacent said hammer and anvil and adapted to clamp the portion of said piece where the lips have been closed, and means for reciprocating said hammer towards and away from said lips, and means for reciprocating said hammer horizontally with reference to said lips.

6. A bending machine comprising means for closing the lips of elongated U-shaped pieces, said means comprising a clamping member, an anvil, and a hammer, said anvil being positioned between said lips, said hammer being positioned immediately over said lips and anvil, said clamping means being positioned adjacent said hammer and anvil and adapted to clamp the portion of said piece where the lips have been closed, means for reciprocating said hammer against said lips, and means for reciprocating said anvil and hammer synchronously with reference to each other and longitudinally with reference to said piece.

7. A bending machine comprising means for bending flanges on an elongated piece, said means comprising means for clamping the piece, an anvil, and a hammer; said anvil being adapted to be positioned at one side of the edge of the piece, said hammer being positioned immediately over said anvil, said clamping means being positioned adjacent said hammer and anvil and adapted to clamp the portion of said piece where the flange has been bent; means for reciprocating said hammer against said flange, and means for reciprocating said anvil and hammer synchronously with reference to each other and longitudinally with reference to said piece, said clamping means being arranged to prevent movement of said piece in one direction but allowing movement-ofthe said piece in the opposite direction.

8. A machine for bending flanges on elo n gated pieces, said machine comprising an anvil, a hammer mounted for reciprocation over said anvil, and clamping means positioned adjacent said anvil and hammer, said clamping means comprising a fixed member and a yielding member, said yielding member being positioned beneath said hammer and being adapted to receive and support one end of said piece with the anvil positioned at one side of the flange thereof, and means for reciprocating said hammer vertically.

9. A machine for bending flanges on metal pieces, said machine comprising an anvil, a hammer mounted for reciprocation over said anvil, and clamping means positioned adjacent said anvil and hammer, said clamping means comprising a fixed member and a yielding member, said yielding member being adapted to receive and support one end of said piece with the anvil positioned between the lips thereof, means for reciprocating said hammer and anvil longitudinally of said piece, and means for reciprocating said'hammer at right angles tosaid piece.

10. A machine for bending flanges on elongated metal pieces, comprising an anvil, a hammer mounted for reciprocation'over said anvil, and means for clamping the piece positioned adjacent said anviland hammer, said clamping means comprising a fixed member and a yielding member, said yielding member being adapted to receive and support said piece with the anvil positioned at one. side of the flange thereof, means for reciprocating said'ha'mmer and anvil longitudinally of said piece, and means for recipro'cating said hammer at right angles tosaid piece, said longitudinally reciprocating means being arranged to operate alternately with said right-angled reciprocating means.

11. A machine for bending edges of metal pieces, comprising an anvil, a hammer mounted for reciprocation over said anvil, and clamping means positioned adjacent said anvil and said hammer, said clamping means comprising a fixed member and a yielding member, said yielding member being adapted to receive and yieldingly support one of said pieces with the anvil positioned adjacent the edge to be bent, means for reciprocating said hammer and anvil longitudinally of said piece, and means for reciprocating said anvil at right angles to said piece, said longitudinally reciprocating means being arranged tooperate alternately'with said right-angled reciprocating means" and arranged so that the hammer moves upwardly just before it moves away from the clamping means. I

l2. A machine for bending the edges of tapering metal pieces, comprising a hammer and an anvil, each having a face-conforming to the desired form of the edge, and a clamp having a fixed upper member and a yielding lower member, said clam-p being adapted to hold one of the pieces to be bent with its edge between the hammer and anvil, means for reciprocating said hammer vertically with reference to said anvil, and means for reciprocating said hammer and anvil horizontally.

13. A bending mechanism comprising means for receiving strips with U-shaped cross-sections and then, for closing the sides of said strips so a to form tubular members, the said closing mechanism comprising an anvil andsa hammer positioned vertically in line with said anvil, means for reciprocating said hammer over said anvilvertically and horizontally, the operating surface of said hammer being curved similarly to the curved surface that is to be produced.-

14. A machine for bending towards each other the edges of adjacent flanges, comprising a hammer member mounted for alternately reciprocating in two planes substantially at right angles to each other, and means for reciprocating said hammer in each of said planes.

15. A machine for bending towards each other the edges of adjacent flanges, comprising a hammer member, means for alternately reciprocating said hammer in two planes substantially at right angles toeach other, an anvil, means for reciprocating said anvil with said hammer in one of said planes, and means for reciprocating said hammer and anvil. y

'16. A machine for bending towards each other the edges of adjacent flanges,- comprising a hammer member, means for recipro eating said hammer in two planes substantially at right angles to each other, an anvil member, means mounted for reciprocating said anvil with said hammer in one of said planes, and means for guiding the edges of said flanges between said two-members.

17. A machine for bending towards each other the edges of adjacent flanges, comprising a hammer member, means for reciproeating said hammer in two planes substantially at right angles to each other, an anvil member, meansfor reciprocating said anvil with said hammer in one of said planes, said members being arranged to clamp said flanges while reciprocating in one direction in one of said planes, said anvil and hammer being vertically alined.

18. A machine for bending towards each other the edges of adjacent flanges, comprising a hammer member, means for reciproeating said hammer in two planes substantially at right angles to each other, an anvil member, means for reciprocating said anvil with said hammer in one of said planes, said members being arranged to clamp said flanges while reciprocating in one direction in one of said planes and to release said flanges before moving in said plane in the opposite direction. j j

19. A machine for bending towards each other the. edges of adjacent, flanges, coinprising a hammer member, means for reciprocating said hammer in two planes substantially at right angles to each other, an anvil member, means for reciprocating said anvil with said hammer in one of said planes, said members being arranged to clamp said flanges while reciprocating in one direction in one of said planes and to release said flanges before moving in said plane in the opposite direction, and means for preventing said flanges from moving with said members in said opposite direction.

20. Bending mechanism comprising means for receiving strips with U-shaped cross-sections, and means for closing the sides of said strips so that they form tubular members, said closing mechanism comprising an anvil and a hammer, and means for alternately reciprocating said hammer both vertically and longitudinally.

In testimony whereof, I hereunto set my hand.

OTTO SGHACHTEL. 

